Water-Fat Separation with a Bipolar Multiecho 3D Concentric Cylinders Trajectory

Kie Tae Kwon¹, Holden H. Wu¹, ², Dwight G. Nishimura¹

For water-fat separation using Dixon techniques, a bipolar multi-echo sequence acquires data more efficiently than a comparable unipolar multi-echo sequence, and also enables more robust field map estimation by shortening echo-spacings, which is crucial for reliable water-fat separation. In this work, a variation of the bipolar multiecho sequence was implemented with a 3D concentric cylinders trajectory. The concentric cylinders sequence requires fewer excitations than a comparable 3DFT sequence, thereby enabling a further scan time reduction while maintaining robustness to off-resonance effects.